Bedienungsanleitung Vaillant aroTHERM VWL 55-2 (Seite 7 von 52) (Englisch)

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Notes on the documentation 2

0020147164_04 aroTHERM Installation instructions 7

2 Notes on the documentation

2.1 Observing other applicable documents

▶ You must observe all the operating and installation in-

structions included with the system components.

2.2 Storing documents

▶ Pass these instructions and all other applicable docu-

ments on to the system operator.

2.3 Applicability of the instructions

These instructions apply to units with the following type des-

ignations and article numbers only:

Type designation Art. no.

aroTHERM VWL 55/2 A 230 V 0010014566

aroTHERM VWL 85/2 A 230 V 0010011971

aroTHERM VWL 115/2 A 230 V 0010011972

aroTHERM VWL 155/2 A 230 V 0010014567

The seventh to sixteenth digits of the serial number on the

identification plate form the article number.

3 System overview

3.1 Safety devices

– The product can work at the following outside temperat-

ures:

VWL 55/2 A 230 V VWL 85/2 A 230 V

VWL 115/2 A 230 V

VWL 155/2 A 230 V

Heating mode −15 … 28 ℃ −20 … 28 ℃

Cylinder charging

mode

−15 … 46 ℃ −20 … 46 ℃

– If the product's coolant circuit pressure exceeds the max-

imum pressure of 4.15 MPa (41.5 bar), the high-pres-

sure pressure switch switches the product off. Follow-

ing a waiting period, the product attempts to start once

more. After three failed start attempts in succession, a

fault message is displayed.

– If the product is switched off, the crankcase housing

heating is switched on when the compressor outlet tem-

perature reaches 7 °C in order to prevent possible dam-

age caused by switching it back on.

– If the compressor inlet temperature and the compressor

outlet temperature are below 1 °C, the compressor does

not start up.

– A temperature sensor on the compressor outlet limits the

product's operation if the measured temperature exceeds

the maximum permissible temperature. The maximum

permissible temperature depends on the evaporation and

condensation temperature.

– The product measures the flow rate of the connected

heating circuit when starting up the product.

– If the heating circuit temperature falls below 3 °C, the

product's frost protection function is automatically ac-

tivated as the heating pump is started. In addition, frost

protection agent should be added to the heating water as

the heating water temperature may fall below the freez-

ing point in the event of a power cut, which poses a risk

of frost to the heating installation.

Note

Operating the heat pump outside the application

limits results in the heat pump being switched off

by the internal control and safety devices.

3.2 Design of the heat pump system

The heat pump system consists of the following components:

– aroTHERM heat pump

– VWZ AI heat pump control module

– Additional hydraulic components, if required

– VRC 470 system controller

The heat pump can be operated by the VWZ AI heat pump

control module. The extended operation of the heat pump is

carried out by the system controller.

3.3 Functionality

The product comprises the following circuits:

– The coolant circuit releases heat into the heating circuit

by means of evaporation, compression, condensation

and expansion

– The heating circuit

3.3.1 Heating mode

1 Evaporator

2 4-way valve

3 Fan

4 Compressor

5 Electronic expansion valve

6 Plate heat exchanger

3.3.2 Thawing

1 Evaporator 2 4-way valve

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